4921978843 has 2 divisors, whose sum is σ = 4921978844. Its totient is φ = 4921978842.

The previous prime is 4921978829. The next prime is 4921978849. The reversal of 4921978843 is 3488791294.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4921978843 - 2⁹ = 4921978331 is a prime.

It is not a weakly prime, because it can be changed into another prime (4921978849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460989421 + 2460989422.

It is an arithmetic number, because the mean of its divisors is an integer number (2460989422).

Almost surely, 2^4921978843 is an apocalyptic number.

4921978843 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921978843 is an equidigital number, since it uses as much as digits as its factorization.

4921978843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 55.

The square root of 4921978843 is about 70156.8160836850. The cubic root of 4921978843 is about 1701.0349917798.

The spelling of 4921978843 in words is "four billion, nine hundred twenty-one million, nine hundred seventy-eight thousand, eight hundred forty-three".